South Park episode Chickenpox
South Park - Episode 0210 - Original Air Date: 26th August 1998
The kids' parents only have their best interests at heart when they arrange for Stan, Kyle and Cartman to be exposed to the chickenpox virus. The boys see things differently and decide to get even with the help of a streetwalker named Old Frida. Meanwhile, Kyle and Kenny's fathers try to rekindle their childhood friendship, despite their socio-economic differences.
For those who don't know, on the way to Kenny's house, Cartman sings "In the Ghetto" by Elvis Presley.
South Park Spoiler Alert!
(The complete plot for this South Park Episode)
Chickenpox begins to spread throughout South Park, and infects Stan's sister Shelley and Kenny. The other boys' mothers begin to think that maybe the other boys should be exposed to it too, so as to get it while they are young and it is easier to deal with. They agree, and the other boys stay over at Kenny's house. The boys are less than enthusiastic about spending the night over at Kenny's because he is so poor. The dinner is a meager waffle per person with no side dishes. The next day, Cartman and Stan get sick, but not Kyle. Stan's chickenpox gets so bad he has to be brought to the hospital with Shelley.
Meanwhile, Mrs. Broflovski, after discovering that her husband and Mr. McCormick had once been close friends, decides to try to patch things up between them by setting them both up on a fishing trip. However, the trip does not work out too well and the two men come to blows. Apparently, Mr McCormick is jealous of Gerald Broflovski's success, while Gerald makes a speech to Kyle about how some people need to be poorer than others as part of a capitalist society, what he calls the hierarchy of "gods and clods." This leads Kyle to coming up with a plan to eliminate all the clods in the world to make it a better place, which makes Gerald realize the callousness of his beliefs.
Stan breaks out of the hospital, and all of the boys decide to get revenge on the adults for what they did. The parents begin a frantic search, while the boys go see Old Frida, a local prostitute with herpes in her mouth, and pay her to go to their homes and lick, touch and otherwise mess with the parents' stuff to give them all herpes. The parents find the children and bring them back to the hospital; at this point Kyle finally falls ill and passes out on the floor, making Sheila realize what a horrible thing she has done.
All the boys wind up in the hospital, and the parents get herpes, which they agree was fair revenge for what they tried to do.